Critical Thinking On The Web – An online critical thinking directory from Austhink. The site has many resources ranging from arguments to logic and critical thinking tutorials.

Critical Thinking Compendium – A wiki resource for teaching critical thinking and Internet literacies that is led by Howard Rheingold and other respected educators.

Critical Thinking Web – Site that contains over 100 free online tutorials on critical thinking, logic, scientific reasoning, creativity, and other aspects of thinking skills by the Philosophy Department at the University of Hong Kong.